Question 1

The sprue is removed with a thin _____ disc.

Accepted Answer

A)  carbide 
B)  stainless steel 
C)  carborundum 
D)  diamond 
A)  carbide 
B)  stainless steel 
C)  carborundum 
D)  diamond C

Question 2

The required temperature of a burnout oven for proper casting will vary,depending on:

Accepted Answer

A)  type of investment. 
B)  liquidus of the alloy to be cast. 
C)  composition of the alloy to be cast. 
D)  A, B, and C. 
E)  A and C. 
A)  type of investment. 
B)  liquidus of the alloy to be cast. 
C)  composition of the alloy to be cast. 
D)  A, B, and C. 
E)  A and C. D

Question 3

The investment material is _____; the wax pattern is _____.

Accepted Answer

A)  hydrophilic; hydrophilic 
B)  hydrophilic; hydrophobic 
C)  hydrophobic; hydrophilic 
D)  hydrophobic; hydrophobic 
A)  hydrophilic; hydrophilic 
B)  hydrophilic; hydrophobic 
C)  hydrophobic; hydrophilic 
D)  hydrophobic; hydrophobic B

Question 4

Following removal of a ring from the burnout oven,any delay in casting of more than _____ will severely compromise the fit and quality of the cast restoration.

Accepted Answer

A)  1 to 2 seconds 
B)  8 to 10 seconds 
C)  20 to 30 seconds 
D)  60 to 90 seconds 
E)  2 to 3 minutes 
A)  1 to 2 seconds 
B)  8 to 10 seconds 
C)  20 to 30 seconds 
D)  60 to 90 seconds 
E)  2 to 3 minutes

Question 5

Rapidly cooling a casting in cold water is referred to as:

Accepted Answer

A)  soldering. 
B)  brazing. 
C)  pickling. 
D)  bench cooling. 
E)  quenching. 
A)  soldering. 
B)  brazing. 
C)  pickling. 
D)  bench cooling. 
E)  quenching.

Question 6

Which of the following sequences describing the steps involved in making a dental casting from start to finish is correct?

Accepted Answer

A)  Burnout, casting, making the wax pattern, spruing the pattern, investing, removal of investment, pickling, and finishing 
B)  Making the wax pattern, burnout, casting, spruing the pattern, investing, removal of investment, pickling, and finishing 
C)  Making the wax pattern, spruing the pattern, burnout, casting, investing, removal of investment, pickling, and finishing 
D)  Making the wax pattern, spruing the pattern, investing, burnout, casting, removal of investment, pickling, and finishing 
A)  Burnout, casting, making the wax pattern, spruing the pattern, investing, removal of investment, pickling, and finishing 
B)  Making the wax pattern, burnout, casting, spruing the pattern, investing, removal of investment, pickling, and finishing 
C)  Making the wax pattern, spruing the pattern, burnout, casting, investing, removal of investment, pickling, and finishing 
D)  Making the wax pattern, spruing the pattern, investing, burnout, casting, removal of investment, pickling, and finishing

Question 7

The purpose of flux is to minimize:

Accepted Answer

A)  melting time. 
B)  melting temperature. 
C)  oxidation. 
D)  freezing time. 
A)  melting time. 
B)  melting temperature. 
C)  oxidation. 
D)  freezing time.

Question 8

Casting alloys are melted using:

Accepted Answer

A)  a blowtorch. 
B)  an electric current. 
C)  a casting oven. 
D)  all of the above. 
E)  only A and B. 
A)  a blowtorch. 
B)  an electric current. 
C)  a casting oven. 
D)  all of the above. 
E)  only A and B.

Question 9

Most casting is done:

Accepted Answer

A)  by press molding. 
B)  by slip casting. 
C)  in a linear casting machine. 
D)  in a centrifugal casting machine. 
A)  by press molding. 
B)  by slip casting. 
C)  in a linear casting machine. 
D)  in a centrifugal casting machine.

Question 10

Which of the following statements is true of investments used for casting?

Accepted Answer

A)  The refractory material in most dental investment is a form of calcium. 
B)  The binder, but not the refractory material, contributes to expansion of the investment. 
C)  The refractory material, but not the binder, contributes to expansion of the investment. 
D)  The binder and the refractory material contribute to expansion of the investment. 
E)  The binder and the refractory material contribute to contraction of the investment. 
A)  The refractory material in most dental investment is a form of calcium. 
B)  The binder, but not the refractory material, contributes to expansion of the investment. 
C)  The refractory material, but not the binder, contributes to expansion of the investment. 
D)  The binder and the refractory material contribute to expansion of the investment. 
E)  The binder and the refractory material contribute to contraction of the investment.

Question 11

The accuracy of a cast crown may be as good as ____% in dimensional change from the wax pattern if care is taken to perform each step properly.

Accepted Answer

A)  1 
B)  0.5 
C)  0.1 
D)  0.05 
E)  0.01 
A)  1 
B)  0.5 
C)  0.1 
D)  0.05 
E)  0.01

Question 12

Because cast metal shrinks as it freezes,investment must _____ as it sets.

Accepted Answer

A)  shrink 
B)  expand 
C)  stay the same 
A)  shrink 
B)  expand 
C)  stay the same

Question 13

The temperature in a burnout oven is commonly _____ for high noble alloys.

Accepted Answer

A)  100° C 
B)  100° F 
C)  500° C 
D)  500° F 
E)  1000° C 
A)  100° C 
B)  100° F 
C)  500° C 
D)  500° F 
E)  1000° C

Question 14

If base-metal castings are pickled,_____ will occur.

Accepted Answer

A)  oxidation 
B)  corrosion 
C)  tarnish 
D)  shrinkage 
A)  oxidation 
B)  corrosion 
C)  tarnish 
D)  shrinkage

Question 15

A casting alloy is heated in a _____ made of heat-resistant ceramic.

Accepted Answer

A)  casting ring 
B)  burnout oven 
C)  crucible 
D)  sprue base 
A)  casting ring 
B)  burnout oven 
C)  crucible 
D)  sprue base

Question 16

It is important that the temperature of the molten metal not be more than ________ than the burned out investment.

Accepted Answer

A)  500° F higher 
B)  500° C higher 
C)  500° F lower 
D)  500° C lower 
A)  500° F higher 
B)  500° C higher 
C)  500° F lower 
D)  500° C lower

Question 17

To prevent premature freezing in the sprue channel,sprues are generally as _____ in diameter and as _____ as possible.

Accepted Answer

A)  small; long 
B)  small; short 
C)  large; long 
D)  large; short 
A)  small; long 
B)  small; short 
C)  large; long 
D)  large; short

Question 18

The investment used in casting is _____; the wax pattern is _____.

Accepted Answer

A)  hydrophobic; hydrophobic 
B)  hydrophobic; hydrophilic 
C)  hydrophilic; hydrophilic 
D)  hydrophilic; hydrophobic 
A)  hydrophobic; hydrophobic 
B)  hydrophobic; hydrophilic 
C)  hydrophilic; hydrophilic 
D)  hydrophilic; hydrophobic

Question 19

Investment is retained in a __________ while it sets.

Accepted Answer

A)  mold 
B)  crucible 
C)  casting ring 
D)  centrifuge 
A)  mold 
B)  crucible 
C)  casting ring 
D)  centrifuge

Question 20

Expansion of the binder from added water to the investment is called _____ expansion.

Accepted Answer

A)  hygroscopic 
B)  thermal 
C)  chemical 
D)  burnout 
A)  hygroscopic 
B)  thermal 
C)  chemical 
D)  burnout

The sprue is removed with a thin _____ disc.

The required temperature of a burnout oven for proper casting will vary,depending on:

The investment material is _; the wax pattern is _.

Following removal of a ring from the burnout oven,any delay in casting of more than _____ will severely compromise the fit and quality of the cast restoration.

Rapidly cooling a casting in cold water is referred to as:

Which of the following sequences describing the steps involved in making a dental casting from start to finish is correct?

The purpose of flux is to minimize:

Casting alloys are melted using:

Most casting is done:

Which of the following statements is true of investments used for casting?

The accuracy of a cast crown may be as good as ____% in dimensional change from the wax pattern if care is taken to perform each step properly.

Because cast metal shrinks as it freezes,investment must _____ as it sets.

The temperature in a burnout oven is commonly _____ for high noble alloys.

If base-metal castings are pickled,_____ will occur.

A casting alloy is heated in a _____ made of heat-resistant ceramic.

It is important that the temperature of the molten metal not be more than ________ than the burned out investment.

To prevent premature freezing in the sprue channel,sprues are generally as _ in diameter and as _ as possible.

The investment used in casting is _; the wax pattern is _.

Investment is retained in a __________ while it sets.

Expansion of the binder from added water to the investment is called _____ expansion.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, polishing, and Cleansing Materials

Cements

Impression Materials

Model and Die Materials

Waxes

Casting Alloys, wrought Alloys, and Solders

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Exam 12: Casting and Soldering

The sprue is removed with a thin _____ disc.

The required temperature of a burnout oven for proper casting will vary,depending on:

The investment material is _____; the wax pattern is _____.

Following removal of a ring from the burnout oven,any delay in casting of more than _____ will severely compromise the fit and quality of the cast restoration.

Rapidly cooling a casting in cold water is referred to as:

Which of the following sequences describing the steps involved in making a dental casting from start to finish is correct?

The purpose of flux is to minimize:

Casting alloys are melted using:

Most casting is done:

Which of the following statements is true of investments used for casting?

The accuracy of a cast crown may be as good as ____% in dimensional change from the wax pattern if care is taken to perform each step properly.

Because cast metal shrinks as it freezes,investment must _____ as it sets.

The temperature in a burnout oven is commonly _____ for high noble alloys.

If base-metal castings are pickled,_____ will occur.

A casting alloy is heated in a _____ made of heat-resistant ceramic.

It is important that the temperature of the molten metal not be more than ________ than the burned out investment.

To prevent premature freezing in the sprue channel,sprues are generally as _____ in diameter and as _____ as possible.

The investment used in casting is _____; the wax pattern is _____.

Investment is retained in a __________ while it sets.

Expansion of the binder from added water to the investment is called _____ expansion.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, polishing, and Cleansing Materials

Cements

Impression Materials

Model and Die Materials

Waxes

Casting Alloys, wrought Alloys, and Solders

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

The investment material is _; the wax pattern is _.

To prevent premature freezing in the sprue channel,sprues are generally as _ in diameter and as _ as possible.

The investment used in casting is _; the wax pattern is _.